وَإِنْ شَاءَ اشْتَرَى بِهَا طَعَامًا، فَتَصَدَّقَ بِهِ عَلَى كُلِّ مِسْكِينٍ نِصْفَ صَاعٍ مِنْ بُرٍّ، أَوْ صَاعًا مِنْ تَمْرٍ، أَوْ صَاعًا مِنْ شَعِيرٍ.
Translation: Alternatively, the value may be used to buy food: each poor recipient receives half a saʿ of wheat, or one saʿ of dates, or one saʿ of barley.
This is the feeding option: food is bought against the appraised value and distributed in the designated share per needy recipient.
The book specifies half a saʿ of wheat versus a whole saʿ of dates or barley; the three measures must not be flattened into one.